Focus a DOM element in Safari by CSS selector — triggers the focus event which can reveal dropdowns, enable keyboard input, or activate UI components. Unlike click, focus does not generate a click event.
AI agents invoke focus_element to trigger actions in MacWright. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool triggers browser-level DOM events (focus) in Safari, which can cause active UI side effects such as revealing dropdowns and enabling input. It performs an external browser operation whose effects depend on the CSS selector argument, placing it in the Execute category.
From the tool's definition Focus a DOM element in Safari by CSS selector — triggers the focus event which can reveal dropdowns, enable keyboard input, or activate UI components
Attacks that exploit this kind of access
Focus a DOM element in Safari by CSS selector — triggers the focus event which can reveal dropdowns, enable keyboard input, or activate UI components. Unlike click, focus does not generate a click event. It is categorised as a Execute tool in the MacWright MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MacWright MCP server in PolicyLayer and add a rule for focus_element: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MacWright. Nothing to install.
focus_element is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the focus_element rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for focus_element. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
focus_element is provided by the MacWright MCP server (ruchit-p/macwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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